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172.104.27.231 has a threat confidence score of 24%. This IP address from United States (AS63949, Akamai Connected Cloud) has been observed in 5 honeypot sessions targeting SIP, SMTP, IMAP protocols. First observed on February 24, 2026, most recently active March 27, 2026.
Automated SMTP interaction performing a minimal capability check by issuing EHLO followed by a STARTTLS upgrade request and immediately terminating the session. This pattern is commonly associated with internet-wide scanners, security research crawlers, or opportunistic bots verifying whether an SMTP service supports encrypted communication. The absence of authentication attempts or message submission indicates reconnaissance or service fingerprinting rather than active abuse.